TiO2/water Nanofluid Heat Transfer in Heat Exchanger Equipped with Double Twisted-Tape Inserts

International Conference on Nanomaterials and Biomaterials 2017

材料科学;物理学;生物科学

Eiamsa-Ard, S.^1 ; Ketrain, R.^2 ; Chuwattanakul, V.^3

Faculty of Engineering, Mahanakorn University of Technology, Bangkok, Thailand^1

Royal Irrigation Department, Samsen Nakornchaisri, Bangkok, Thailand^2

Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok, Thailand^3

关键词: Friction factors;    Heat exchanger tube;    Heat Transfer enhancement;    Heat transfer rate;    High power electronics;    Improving efficiency;    Thermal Performance;    Twisted tape insert;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/350/1/012015/pdf
DOI  :  10.1088/1757-899X/350/1/012015

来源: IOP

【 摘 要 】

Nowadays, heat transfer enhancement plays an important role in improving efficiency of heat transfer and thermal systems for numerous areas such as heat recovery processes, chemical reactors, air-conditioning/refrigeration system, food engineering, solar air/water heater, cooling of high power electronics etc. The present work presents the experimental results of the heat transfer enhancement of TiO2/water nanofluid in a heat exchanger tube fitted with double twisted tapes. The study covered twist ratios of twisted tapes (y/w) of 1.5, 2.0, and 2.5) while the concentration of the nanofluid was kept constant at 0.05% by volume. Observations show that heat transfer, friction loss and thermal performance increase as twist ratio (y/w) decreases. The use of the nanofluid in the tube equipped with the double twisted-tapes with the smallest twist ratio (y/w = 1.5) results in the increases of heat transfer rates and friction factor up to 224.8% and 8.98 times, respectively as compared to those of water. In addition, the experimental results performed that double twisted tapes induced dual swirling-flows which played an important role in improving fluid mixing and heat transfer enhancement. It is also observed that the TiO2/water nanofluid was responsible for low pressure loss behaviors.